Re: [PATCH 1/5] pci-assign: Clean up assigned_dev_pci_read/write_config

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 2011-04-28 16:29, Alex Williamson wrote:
> On Thu, 2011-04-28 at 10:59 +0200, Jan Kiszka wrote:
>> Use rages_overlap and proper constants to match the access range against
>       ^^^^^ typo - only if you resend
> 
>> regions that need special handling. This also fixes yet uncaught
>> high-byte write access to the command register. Moreover, use more
>> constants instead of magic numbers.
>>
>> Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
>> ---
>>  hw/device-assignment.c |   39 +++++++++++++++++++++++++++++----------
>>  1 files changed, 29 insertions(+), 10 deletions(-)
>>
>> diff --git a/hw/device-assignment.c b/hw/device-assignment.c
>> index 606d725..3481c93 100644
>> --- a/hw/device-assignment.c
>> +++ b/hw/device-assignment.c
>> @@ -404,13 +404,20 @@ static void assigned_dev_pci_write_config(PCIDevice *d, uint32_t address,
>>          return assigned_device_pci_cap_write_config(d, address, val, len);
>>      }
>>  
>> -    if (address == 0x4) {
>> +    if (ranges_overlap(address, len, PCI_COMMAND, 2)) {
>>          pci_default_write_config(d, address, val, len);
>>          /* Continue to program the card */
>>      }
>>  
>> -    if ((address >= 0x10 && address <= 0x24) || address == 0x30 ||
>> -        address == 0x34 || address == 0x3c || address == 0x3d) {
>> +    /*
>> +     * Catch access to
>> +     *  - base address registers
>> +     *  - ROM base address & capability pointer
>> +     *  - interrupt line & pin
>> +     */
>> +    if (ranges_overlap(address, len, PCI_BASE_ADDRESS_0, 24) ||
>> +        ranges_overlap(address, len, PCI_ROM_ADDRESS, 8) ||
> 
> Should this be 5 bytes instead of 8?  I'm not sure why we'd add catching
> these reserved fields, but not those immediately after this range.

Yes, that's asking for clarification: Should we allow direct access to
the complete reserved space or virtualize it? Depending on this, the
proper value should be 5 or 14 (the latter would also save one
ranges_overlap).

Jan

-- 
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [KVM ARM]     [KVM ia64]     [KVM ppc]     [Virtualization Tools]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite Questions]     [Linux Kernel]     [Linux SCSI]     [XFree86]
  Powered by Linux